Powerocks Blue Magic Cube Universal 6000mAh Extended Battery Built-in USB and Micro USB cables Smart and fashionable, convenient for traveling Compatible with iPhone, Blackberry and other portable devices charged via USB cable Compatible with Apple products and other universal Micro USB charging ports Battery status is indicated by the LED lights on the end of the Magic Cube. 4 lights = 100% full, 3 lights = 75% full, 2 lights = 50% full, 1 light = 25%